Problem adding a name to nginx

I’ve had an nginx server running with 4 hostnames (reverse proxy)… I wanted to add one more, but suddenly I get errors which I find weird…

Here are the error messages

  • The following errors were reported by the server:

    Domain: ebsco.meu.edu.lb
    Type: unknownHost
    Detail: No valid IP addresses found for ebsco.meu.edu.lb

    Domain: internal.meu.edu.lb
    Type: unknownHost
    Detail: No valid IP addresses found for internal.meu.edu.lb

    To fix these errors, please make sure that your domain name was
    entered correctly and the DNS A/AAAA record(s) for that domain
    contain(s) the right IP address.

However, testing nslookup everything is working… one of the records is an A record, the others are CNAME records…

internal.meu.edu.lb
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
Name: internal.meu.edu.lb
Address: 185.125.158.24

ebsco.meu.edu.lb
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
ebsco.meu.edu.lb canonical name = internal.meu.edu.lb.
Name: internal.meu.edu.lb
Address: 185.125.158.24

So, what am I doing wrong? What did I miss?

Thanks in advance!

There seems to be something wrong with AAAA (IPv6-address) records:

$ host -ta internal.meu.edu.lb
internal.meu.edu.lb has address 185.125.158.24

$ host -taaaa internal.meu.edu.lb
Host internal.meu.edu.lb not found: 3(NXDOMAIN)

If the domain does not have AAAA records, the answer should be:

internal.meu.edu.lb has no AAAA record

There is no AAAA record for any of our hosts… and when I run the command,
this is what I get regularly across several domains (and continents).

$ host -taaaa internal.meu.edu.lb

internal.meu.edu.lb has no AAAA record

Whose DNS is giving the incorrect answer? How do I solve this?

Thanks in advance,

Ron

There seems to be something wrong with AAAA (IPv6-address) records:

$ host -ta internal.meu.edu.lb http://internal.meu.edu.lb
internal.meu.edu.lb http://internal.meu.edu.lb has address
185.125.158.24

$ host -taaaa internal.meu.edu.lb http://internal.meu.edu.lb
Host internal.meu.edu.lb http://internal.meu.edu.lb not found:
3(NXDOMAIN)

If the domain does not have AAAA records, the answer should be:

internal.meu.edu.lb http://internal.meu.edu.lb has no AAAA record

This was a local unbound dns-cache.
If I ask the google caches, the answers are correct.

Nevertheless, I think authorative nameservers are somewhat mixed:

$ dig @8.8.8.8 internal.meu.edu.lb NS
;; AUTHORITY SECTION:
meu.edu.lb. 299 IN SOA dns0.zoneedit.com. zone.zoneedit.com. 1511867332 3600 600 1209600 300

So primary for this zone must be dns0.zoneedit.com.
Now ask him:

$ dig @dns0.zoneedit.com internal.meu.edu.lb A
;; ANSWER SECTION:
internal.meu.edu.lb. 300 IN A 185.125.158.24
;; AUTHORITY SECTION:
meu.edu.lb. 7200 IN NS ns6069.hostgator.com.
meu.edu.lb. 7200 IN NS ns6070.hostgator.com.

OK, this resolves correctly. But there are DNS delegations to two nameserver of hostgator. These should reply the same way.

$ dig @ns6069.hostgator.com. internal.meu.edu.lb A
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24901
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;internal.meu.edu.lb. IN A
;; AUTHORITY SECTION:
meu.edu.lb. 86400 IN SOA ns6069.hostgator.com. dnsadmin.gator3035.hostgator.com. 2016061305 86400 7200 3600000 86400

I have to admit: I don't know if this is valid or not.

1 Like

Found and solved!

Thanks!

So, what was the problem? It might be interesting for future troubleshooting.

The final problem was root zone .lb pointing to one server, and that server
having NS records pointing elsewhere!

Ron

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